I updated fairly easily on a Windows 7 machine but it's a weird way to update compared to say Canon's firmware update. You need to restart the camera in order for update to proceed after the software verifies that the camera needs updating, they couldn't just start the update after verification. Had to do it twice before I realized why it didn't work.

AF from near to far seemed slightly improved, had no issues locking on to stuff in my basement studio, the NEX-5 had issues at times but the 5n got positive lock.

5N's AF speed is much improved with the new firmware. Here's a video showing before and after firmware update: 5N AF speed comparison

Just updated 5N's firmware, and the AF speed is noticeably faster with much less "hunting" back and forth just like what was shown in the video.

The firmware also fixed one annoying video AF problem - with the "Center Focus Area" selected, the video AF no longer locks focus onto higher contrast areas off to the side. Video AF transitions very smoothly from foreground to background with less "hunting" also.

Just posted two short 5N's video autofocus tests done after the firmware update. The contrast-detection video AF is camcorder quality - pretty smooth and steady, but not fast like the Sony Alpha SLT cameras with phase-detection video AF.

First part: Using touchscreen to select AF areasSecond part: Using just the center AF point